An investigation of intracluster variation of the galaxy luminosity function in Abell clusters

Details An investigation of intracluster variation of the galaxy luminosity function in Abell clusters An investigation of intracluster variation of the galaxy luminosity function in Abell clusters

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..572l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 15, 1989, p. 572-593.

Astronomy and Astrophysics

Astrophysics

32

Galactic Clusters, Luminosity, Astronomical Photometry, Density Distribution, Spatial Distribution

Scientific paper

The luminosity functions of nine Abell clusters, determined from Palomar 1.2 m Schmidt plates, have been examined for evidence of intracluster variation. Nonparametric tests were used to compare samples of galaxies from inner versus outer regions of individual clusters, and high- versus low-density regions of both individual clusters and the composite of all nine clusters. In three clusters (A1656, A2147, and A2199) there appears to be a deficit of bright galaxies in a region of radius 0.5 Mpc about the cluster center relative to a concentric annular region extending from 0.5 to 1.0 Mpc. In the composite luminosity function of all nine clusters for a region 4.56 Mpc on a side, (1) there is evidence for an excess of bright galaxies in the high-density region relative to the low-density region, and (2) there is evidence that the faint end of the differential luminosity function is flatter in the high-density region than in the low-density region. These differences are discussed in terms of models for the dynamical evolution of galaxy clusters.

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